Tether

Tether Operations Limited is the issuer of USD₮ (USDT), the largest stablecoin by circulating supply, along with XAU₮ (gold-backed), USA₮ and EUR₮ tokens issued across Ethereum, Tron, TON, Solana, Bitcoin/Liquid, Avalanche, Polygon, Arbitrum, Plasma and other chains. Beyond token issuance, Tether ships a developer surface centred on the open-source Wallet Development Kit (WDK) — a modular, self-custodial multi-chain wallet framework distributed as @tetherto/* npm packages, a WDK CLI, a React Native UI kit, an MCP Toolkit that exposes 35 wallet, pricing, indexer, swap, bridge, lending and fiat tools to AI agents, a published Agent Skill, and the hosted WDK Indexer REST API (wdk-api.tether.io) for token balances and transfer history. Tether also operates the QVAC local-AI SDK, the Tether Wallet app, and a public bug-bounty program.

Tether publishes 5 APIs on the APIs.io network, including API Keys API, Chains API, Health API, and 2 more. Tagged areas include Company, Stablecoins, Cryptocurrency, Blockchain, and Wallets.

Tether’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, signup flow, CLI, and 27 more developer resources.

🌐 Visit website 📡 Source on GitHub
54.0/100 developing ▬ flat Agent 54/100 agent ready Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0
5 APIs 1 MCP Servers
CompanyStablecoinsCryptocurrencyBlockchainWalletsDigital AssetsPaymentsSelf-CustodyMulti-ChainAgentsMCPOpen Source

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0
Composite quality — 54.0/100 · developing
Contract Quality 10.2 / 21
Developer Ergonomics 14.8 / 17
Commercial Clarity 5.8 / 17
Operational Transparency 7.0 / 11
Governance 1.2 / 10
Discoverability 7.9 / 9
Regulatory Posture 7.3 / 15
Agent readiness — 54/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/tether: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Tether API Keys API

The API Keys API from Tether — 2 operation(s) for api keys.

Tether Chains API

Supported blockchains and token discovery

Tether Health API

Server health and status checks

Tether Token Balances API

Query current token balances for addresses

Tether Token Transfers API

Query token transfer history for addresses

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

WDK Indexer API Keys API

OPEN COLLECTION

WDK Indexer Chains API

OPEN COLLECTION

WDK Indexer Health API

OPEN COLLECTION

WDK Indexer Token Balances API

OPEN COLLECTION

WDK Indexer Token Transfers API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

tether-mcp.yml

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

Tether Rate Limits

6 limits

RATE LIMITS

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Tether Authentication

apiKey · 1 scheme

SECURITY

Tether Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Tether Vulnerability Disclosure

Hackerone · security.txt

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Sandbox
Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference
 OpenAPI
OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 MCPServer
MCPServer
 AgentSkill
AgentSkill
 WellKnown
WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Components
Components
 Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 DataModel
DataModel
 Lifecycle
Lifecycle
 Conformance
Conformance

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI
 ToolCrosswalk
ToolCrosswalk

Access & Security 4

Authentication, authorization, and security posture

Security
Security
 Authentication
Authentication
 DomainSecurity
DomainSecurity
 VulnerabilityDisclosure
VulnerabilityDisclosure

Operate 3

Status, limits, changes, and where to get help

Support
Support
 RateLimits
RateLimits
 ChangeLog
ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: tether
name: Tether
description: Tether Operations Limited is the issuer of USD₮ (USDT), the largest stablecoin by circulating supply, along with
  XAU₮ (gold-backed), USA₮ and EUR₮ tokens issued across Ethereum, Tron, TON, Solana, Bitcoin/Liquid, Avalanche, Polygon,
  Arbitrum, Plasma and other chains. Beyond token issuance, Tether ships a developer surface centred on the open-source Wallet
  Development Kit (WDK) — a modular, self-custodial multi-chain wallet framework distributed as @tetherto/* npm packages,
  a WDK CLI, a React Native UI kit, an MCP Toolkit that exposes 35 wallet, pricing, indexer, swap, bridge, lending and fiat
  tools to AI agents, a published Agent Skill, and the hosted WDK Indexer REST API (wdk-api.tether.io) for token balances
  and transfer history. Tether also operates the QVAC local-AI SDK, the Tether Wallet app, and a public bug-bounty program.
url: https://raw.githubusercontent.com/api-evangelist/tether/refs/heads/main/apis.yml
image: https://tether.io/wp-content/themes/tether-io-theme/assets/images/logo.svg
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-05'
modified: '2026-08-05'
tags:
- Company
- Stablecoins
- Cryptocurrency
- Blockchain
- Wallets
- Digital Assets
- Payments
- Self-Custody
- Multi-Chain
- Agents
- MCP
- Open Source
apis:
- aid: tether:tether-api-keys-api
  name: Tether API Keys API
  description: The API Keys API from Tether — 2 operation(s) for api keys.
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - API Keys
  properties:
  - type: OpenAPI
    url: openapi/tether-api-keys-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
- aid: tether:tether-chains-api
  name: Tether Chains API
  description: Supported blockchains and token discovery
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - Chains
  properties:
  - type: OpenAPI
    url: openapi/tether-chains-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
- aid: tether:tether-health-api
  name: Tether Health API
  description: Server health and status checks
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/tether-health-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
- aid: tether:tether-token-balances-api
  name: Tether Token Balances API
  description: Query current token balances for addresses
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - Token Balances
  properties:
  - type: OpenAPI
    url: openapi/tether-token-balances-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
- aid: tether:tether-token-transfers-api
  name: Tether Token Transfers API
  description: Query token transfer history for addresses
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - Token Transfers
  properties:
  - type: OpenAPI
    url: openapi/tether-token-transfers-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://tether.io/
- type: DeveloperPortal
  url: https://docs.wdk.tether.io/
- type: Documentation
  url: https://docs.wdk.tether.io/
- type: APIReference
  url: https://docs.wdk.tether.io/sdk/all-modules
- type: GettingStarted
  url: https://docs.wdk.tether.io/sdk/get-started
- type: Support
  url: https://docs.wdk.tether.io/overview/support
- type: Blog
  url: https://tether.io/news/
- type: GitHubOrganization
  url: https://github.com/tetherto
- type: SignUp
  url: https://wdk-api.tether.io/register
- type: TermsOfService
  url: https://tether.io/terms/
- type: PrivacyPolicy
  url: https://tether.io/privacy/
- type: Security
  url: https://tether.io/bug-bounty/
- type: OpenAPI
  url: openapi/_original/tether-wdk-indexer-openapi-original.yml
- type: Overlay
  url: overlays/tether-wdk-indexer-overlay.yaml
- type: LLMsTxt
  url: llms/tether-llms.txt
- type: Packages
  url: packages/tether-packages.yml
- type: SDKs
  url: packages/tether-packages.yml
- type: CLI
  url: cli/tether-cli.yml
- type: Components
  url: components/tether-components.yml
- type: MCPServer
  url: mcp/tether-mcp.yml
- type: ToolCrosswalk
  url: mcp/tether-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Authentication
  url: authentication/tether-authentication.yml
- type: Conventions
  url: conventions/tether-conventions.yml
- type: RateLimits
  url: rate-limits/tether-rate-limits.yml
- type: ErrorCatalog
  url: errors/tether-problem-types.yml
- type: DataModel
  url: data-model/tether-data-model.yml
- type: Lifecycle
  url: lifecycle/tether-lifecycle.yml
- type: ChangeLog
  url: changelog/tether-changelog.yml
- type: Conformance
  url: conformance/tether-conformance.yml
- type: Sandbox
  url: sandbox/tether-sandbox.yml
- type: WellKnown
  url: well-known/tether-well-known.yml
- type: DomainSecurity
  url: security/tether-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/tether-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-08-05'
  status: enriched
  artifacts_added: 24
  pass: local-v1